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Seiko SNK809 Movement Change

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tintin82

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Discussion starter · #1 ·
Hello,

I have a Seiko SNK809 and it has a 7S26B movement inside. I wanted to know if it is possible to swap out/ change this 7S26B movement with a Seiko NH36A movement? Will a NH36A fit the case and work? I thought if anyone here could shed some light on this it would be very helpful because I could then take a decision to buy a NH36A movement online.

The reason I want to swap out the movement is because the 7S26B has been running fast, about 6 minutes in 12 hours.

The watch is this one:

Image


Thank-you.
 
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#2 ·
The NH36 will fit, but it uses a different stem than the 7s26. So you would have to replace the stem as well as the movement; you could probably reuse your original crown. Also, most NH36 movements are shipped with white day and date dials. If you wanted to retain the original look of your watch, you would have to swap the white dials for black dials, or order a NH36 with black dials (if that's even possible). I think the NH36 uses different dials than your 7s26B, but I am not certain of this (IIRC it uses the same dials as the 7s26C).
 
Discussion starter · #3 ·
byscott said:
The NH36 will fit, but it uses a different stem than the 7s26. So you would have to replace the stem as well as the movement; you could probably reuse your original crown. Also, most NH36 movements are shipped with white day and date dials. If you wanted to retain the original look of your watch, you would have to swap the white dials for black dials, or order a NH36 with black dials (if that's even possible). I think the NH36 uses different dials than your 7s26B, but I am not certain of this (IIRC it uses the same dials as the 7s26C).
Click to expand...
Thank-you so much for the reply, really appreciate it!

I was thinking about ordering this:

Automatic Watch Movement Mens Parts Mechanical Watch Movement NH36 Movement Watch Replace Accessories-in Clock Parts & Accessories from Home & Garden on Aliexpress.com | Alibaba Group

I don't think the white date bar would bother me too much and I can learn to live with it.

Can you please explain the "different dial" bit to me please? Won't the dial of my SNK809 fit with the above NH36A movement? Or is it the date mechanism your referring to?
 
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#4 ·
6 minutes in 12 hours? Have you tried the trick of letting the watch wind completely down, and then giving it a firm thwap with the hand to unstick any potential catches with the spring?

This worked on a friend's watch once after it had been dropped and was running fast.

Definitely don't hit it so hard as to damage it, just a firm bump with your hand to try and unhook a caught spring.
 
#5 ·
Did you try demagnetizing it?
 
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#7 ·
You can get a demagnetizer for way cheaper than the replacement movement. What kind of watch repair guy doesn't have one??

There's plenty of videos on YouTube explaining the process of replacing the movement. You will need to use the NH36 stem, which means you'll need to cut it and mate it to the SNK crown. You'll also need to replace the day wheel since the movement will come with a 3:00 wheel and you need a 4:00 wheel. The one from your old movement should work. Leave the new date wheel in place, though, as the old 7S26B date wheel will not line up correctly with the new movement.

Seriously, get on YouTube and search for NH36 mod. This is not a simple operation.
 
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Discussion starter · #8 ·
This sounds like a rather complicated mod. What I did however do in the last 10 minutes is, I got on Amazon and ordered a de-magnetiser. Will try with that first and hope it resolves the problem.
 
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#9 ·
tintin82 said:
Thank-you so much for the reply, really appreciate it!

I was thinking about ordering this:

Automatic Watch Movement Mens Parts Mechanical Watch Movement NH36 Movement Watch Replace Accessories-in Clock Parts & Accessories from Home & Garden on Aliexpress.com | Alibaba Group

I don't think the white date bar would bother me too much and I can learn to live with it.

Can you please explain the "different dial" bit to me please? Won't the dial of my SNK809 fit with the above NH36A movement? Or is it the date mechanism your referring to?
Click to expand...
Sorry to be unclear ... I was referring to the day and date wheels.
 
#10 ·
This is a powerful demagnetizer if you have access to a soldering gun.

See if you can remember what item or device could have magnetized the watch. If you think cause is impact or vibration, use the procedure Bassline suggested. Slap the watch's face again the palm of your other hand to free the hairspring. Don't do it too hard.
 

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Discussion starter · #11 ·
Bassline said:
6 minutes in 12 hours? Have you tried the trick of letting the watch wind completely down, and then giving it a firm thwap with the hand to unstick any potential catches with the spring?

This worked on a friend's watch once after it had been dropped and was running fast.

Definitely don't hit it so hard as to damage it, just a firm bump with your hand to try and unhook a caught spring.
Click to expand...
I somehow missed reading this post! I'll try this, will let the watch completely wind down first. Thank-you for the suggestion... hoping it works.
 
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#12 · (Edited)
tintin82 said:
I somehow missed reading this post! I'll try this, will let the watch completely wind down first. Thank-you for the suggestion... hoping it works.
Click to expand...
This possible issue is discussed here. https://www.tapatalk.com/groups/seikocitizenforum/seiko-7s26b-vs-7s26a-seiko-read-this-t93337.html

Unless you open the watch to inspect, there's no way to confirm this is the same problem as your watch. If the hairspring on the balance is caught, it has better chance of being freed if the watch is not running.

tintin82 said:
...
Can you please explain the "different dial" bit to me please? Won't the dial of my SNK809 fit with the above NH36A movement? Or is it the date mechanism your referring to?
Click to expand...
byscott said:
Sorry to be unclear ... I was referring to the day and date wheels.
Click to expand...
The stock NH36 day wheel will not line up correctly with the SNK dial. So you would need to use the original. In case you or someone still want to do this, the full procedure is here:
 
#13 ·
Bassline said:
6 minutes in 12 hours? Have you tried the trick of letting the watch wind completely down, and then giving it a firm thwap with the hand to unstick any potential catches with the spring?

This worked on a friend's watch once after it had been dropped and was running fast.

Definitely don't hit it so hard as to damage it, just a firm bump with your hand to try and unhook a caught spring.
Click to expand...
plz don't do this
 
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